Plant and soil responses to mycorrhizal fungi and rhizobacteria in nodulated or nitrate-fertilized peas (Pisum sativum L.) |
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Authors: | G J Bethlenfalvay G Andrade C Azco‘n-Aguilar |
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Institution: | (1) Estacio‘n Experimental del Zaidi‘n, Consejo Superior de Investigaciones Cienti‘ficas, 18008 Granada, Spain, ES |
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Abstract: | Rhizosphere organisms affect plant development and soil stability. This study was conducted to determine the effects of a
vesicular-arbuscular mycorrhizal (VAM) fungus Glomus mosseae (Nicol. &>; Gerd.) Gerd. and Trappe] and a rhizobacterium (Bacillus sp.) on nitrate-fertilized or nodulated pea (Pisum sativum L.) plants and on the status of water-stable soil aggregates. The plants were grown in pots in a yellow clay-loam soil, and
inoculated with the VAM fungus and the rhizobacterium, with one of the two, or with neither. The Bacillus sp. and G. mosseae did not affect shoot dry mass in nodulated plants. Under N fertilization, the VAM fungus enhanced plant growth, while the
rhizobacterium inhibited shoot growth, VAM root colonization, and nodule formation, but enhanced the root:shoot and the seed:shoot
ratios. The inhibition of shoot growth and of root colonization appeared to be related. The water stability and pH of the
VAM soils were higher than those of the non-VAM soils. The rhizobacterium enhanced the water-stable aggregate status in the
non-VAM soils only. Under both N-nutrition regimes, the soils had the greatest proportion of the water-stable aggregates when
inoculated with both rhizo-organisms and the lowest when colonized by neither. The two rhizo-organisms affected both plants
and soil, and these effects were modified by the source of N input through N2 fixation or fertilization.
Received: 5 April 1995 |
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Keywords: | Bacillus Glomus Mycorrhiza Pisum sativum Plant response Rhizosphere Root nodule Soil aggregation Soil pH Symbiosis |
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